The card allows you to top up your Roblox account on your own for an amount of RS400. How to top up your account:1. Log in to your Roblox account on your computer or go to the website: roblox.com/redeem2. Copy the code you received in the email, then paste it into the empty field and click on the "Redeem" option.3. You will receive information about the replenishment of your account with the appropriate amount of Robux.4. You're all set. You have Robux on your account. The keys work on every account, including the Polish one. After purchase, depending on availability, you will receive one or more codes